<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>052-for-in.html</title>
	<script>
	// 键=>值
	var obj = {
		name:"Chris",
		age:18,
		sex:"male"
	}
	// obj.name =""
	for(key in obj){
		console.log(key,obj.key);
	}
	</script>
</head>
<body>
</body>
</html>